Varsity is a great fountain disposable. They cost $6 for a package of 3 pens, all black, or black, blue and reddish-blue (if I remember right). You can also buy a ten-pack of colored pens, but I haven't tried those. The really great thing about Varsities is that the aluminum nib is very flexible. It's much more flexible than steel nibs in Safari or Core and it's even much more flexible than a gold nib I tried in a pen store. To be fair, that was the cheapest gold pen they had. The seller told me that aluminum nibs are only used in exposables because it won't last very long. This tells me that gold nibs usually won't be very soft, either, because people would be reluctant to pay good money for a nib that wears out quickly.
Varsity pens have one small shortcoming and one that's pretty bad. The first is that it feels pretty cheap especially the cap, and more so the clip on the cap. But let's be fair here, it's an $2 fountain that probably writes better than a mont blanc. We really ought not to be too picky here. Second problem is quite a bit worse though: the ink is very fluid and you really need to pick a firm, decent paper like 25% cotton or higher percentage cotton paper, or one of those thick papers they'll use in slightly more expensive notepads, or in expensive planners. I used one notepad that stood up well to this ink but I can't remember it now. I'll update the page if I do.
It's ironic that this cheapo pen needs expensive paper. For this reason I can't really recommend it. It would be great if it was available with a fine nib - this would perhaps to some extent compensate for ultra-fluid ink, and the truth is that the only nib you get with it is rather large. It makes a thick line, and you'd rather have it make a thin line because you could write very nicely with a flexible but thin nib.